3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data = [ 'c' => [ [ 'q' => 1, ], [ 'q' => 2, ], [ 'q' => 3, ], ] ]; $before = $data; foreach ($data['c'] as &$c) { } $after = $data; var_dump($before === $after); foreach ($data['c'] as $c) { } $after = $data; var_dump($before === $after);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
bool(true) bool(false)
preferences:
213.91 ms | 405 KiB | 303 Q